Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac5f45aa3bd0572…

MALICIOUS

PDF

49.7 KB Created: 2021-06-11 02:18:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b586590f4dc61e828e6267cd3420e8ec SHA-1: ca8fe69db99ff62d54b31d2630161642551aece1 SHA-256: aac5f45aa3bd05725e0d3e13c64b8bba9a324dd2fd4c6bba5cfcc0ecbce4ae1b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document impersonates a brand (Paypal) and uses a 'download button' lure to trick users into clicking a malicious link. The ML classifier strongly flagged this PDF as malicious. The embedded URLs, such as 'https://netcdn.tw/app/431946152/how-do-you-get-free-robux-on-android-game-hack', are likely used to deliver a second-stage payload or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/how-do-you-get-free-robux-on-android-game-hack.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/how-do-you-get-free-robux-on-android-game-hack PDF link annotation
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/krnl-roblox_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-robux-no-survey-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/claim-gg-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52AB 26780 bytes
SHA-256: 01f38eb97aed56593c436465a751108b11df03c541f669058cdcd54df30cbac2
font_01_sfnt_off0000907d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x907D 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D8F 18904 bytes
SHA-256: 9ab8f1e6fd62851e39e9ead28b3528144886a9f232759fcde3c3abfe273a6d69

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